Which of the following research methods looks at one person in depth and generally over a long period of time?

Question

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A case study is a research method that looks at one person or group in depth, generally over a long period of time. It is often used in social sciences and can provide detailed and comprehensive information about a specific individual or situation. Interviews and surveys are methods that can be used within a case study, but they do not necessarily constitute a case study on their own. Experiments involve manipulating variables and testing hypotheses, which is not the same as studying a particular individual in depth.

Which of the Following Research Methods Looks at One Person